12453959 ÷ 353 
We want to divide 12453959 by 353.

Let's proceed to step 1:
353 goes into 1 0 times with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Include the next digit (2) from the dividend after 1, then repeat: 12 / 353

Advancing to step 2:
If we divide 12 by 353, we get 0 and a remainder of 12.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 12, we end up with 12.
Grab the next digit (4) from the dividend, add it to 12, then carry on: 124 / 353

Moving on to step 3:
When dividing 124 by 353, we get 0 with a remainder of 124.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 124 and we're left with 124.
Include the next digit (5) from the dividend after 124, then repeat: 1245 / 353

Step 4:
The number 353 fits into 1245 3 times, leaving a remainder of 186.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
If we subtract 1059 from 1245, we get 186.
Append the next digit (3) from the dividend to 186 and continue with: 1863 / 353

Let's proceed to step 5:
1863 divided by 353 is 5 with a remainder of 98.
Put 5 as the next digit of the answer. 
Result so far: 35.0
Deduct 1765 from 1863 and we're left with 98.
Take the next digit (9) from the dividend and append it to 98, then repeat: 989 / 353

Step 6:
353 can be fit into 989 2 times, resulting in a remainder of 283.
Put 2 as the next digit of the answer. 
Result so far: 352.0
If we subtract 706 from 989, we get 283.
Grab the next digit (5) from the dividend, add it to 283, then carry on: 2835 / 353

Going ahead to step 7:
If we divide 2835 by 353, we get 8 and a remainder of 11.
Use 8 as the next digit of our solution. 
Result so far: 3528.0
If we subtract 2824 from 2835, we get 11.
Fetch the next digit (9) from the dividend, attach it to 11 and continue: 119 / 353

Moving on to step 8:
353 can be fit into 119 0 times, resulting in a remainder of 119.
Record the quotient 0 as the next digit in the result. 
Result so far: 35280.0
Deduct 0 from 119 and we're left with 119.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1190, and continue the process.

Let's proceed to step 9:
If we divide 1190 by 353, we get 3 and a remainder of 131.
The next digit of our result is 3. 
Result so far: 35280.3
Deduct 1059 from 1190 and we're left with 131.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1310, and continue the process.

Advancing to step 10:
1310 divided by 353 is 3 with a remainder of 251.
Use 3 as the next digit of our solution. 
Result so far: 35280.33
The remainder is 251 after subtracting 1059 from 1310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2510, and continue the process.

The quotient of the division is 35280.33, and the remainder is 0.251.